hi Dan,
..........and these can/will eat anything that is green (and a lot of it).

Two summers back there were a bunch of these in my penta bed. I later saw an adult, it was about 2.5 - 3 inches wingspan. The larvae were approximately 3.0 - 3.5 inches and ate entire penta plants. I found 6 of these critters, they ate 9 total plants, stripped clean, leaving only the main plant stalk and stems.